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Old 23rd August 2012, 05:31 PM   #1
geminni is offline geminni  Yugoslavia
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Default Stereo width controll

I want to make stereo widener.
All I have found are schematics that remove center material. I want to add that to center material, not to lose it
I knwo that it can be done because I had an Aiwa cassete player that has one button to add stereo wide and it still sounds great, of course, it depends on music material.
I have been testing numerous combinations but can not find the right one
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Old 23rd August 2012, 05:41 PM   #2
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I think its pretty much the same effect those fake surround sound winamp plugins uses, adding phase shift and such.
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Old 23rd August 2012, 07:22 PM   #3
geminni is offline geminni  Yugoslavia
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I know for all those software thingies but I need hardware version
I have just seen schematics for Aiwa and they use some special circuit for what they call "Q sound". It is MM1434 ic. I'm thinking of making my version of "Q sound" with TL084 or similar.
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Old 23rd August 2012, 07:44 PM   #4
djk is offline djk
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Apt preamp

Look at the schematics for both.
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Old 24th August 2012, 06:36 AM   #5
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Even JLH had a version, it's published here in basic form by Paul Kemble as "image width module". Many magazines and manufacturers copied it back then. A Paul Kemble web page - John Linsley Hood preamp designs.
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Last edited by Ian Finch; 24th August 2012 at 06:38 AM.
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Old 24th August 2012, 07:05 AM   #6
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One simple way to increase width is to make 'mid' and 'side' signals (M,S) then apply gain only to 'side' and re-combine into L and R again. Michael Gerzon played around with applying filtering to the 'side' signal I seem to recall, so you can try making the width frequency dependent.

Mid = 0.5(L+R) ; Side = 0.5(L-R)
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Old 24th August 2012, 07:08 AM   #7
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Rod Elliott has a stereo width controller page here at his ESP site.
I'm also remembering Bob Pease discussing a similar function from a D. Hafler circuit as part of a "What's All This ____ Stuff Anyhow?" entry, but I can't seem to find it.
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Old 24th August 2012, 07:36 AM   #8
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hardware version ?
Play with waveguides around the tweeters
Also midrange , if any , although it may be too difficult to make
a perfect constant directivity device .
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Old 24th August 2012, 08:23 AM   #9
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Quote:
Originally Posted by geminni View Post
I want to make stereo widener.
All I have found are schematics that remove center material. I want to add that to center material, not to lose it
I knwo that it can be done because I had an Aiwa cassete player that has one button to add stereo wide and it still sounds great, of course, it depends on music material.
I have been testing numerous combinations but can not find the right one
Basically you want to vary the differences between the channels. In TV we vary the chroma saturation by changing the amplitude of the chroma difference signals before re-matrixing back to RGB. You can do the same thing in audio by converting your L and R signals by summing to L+R and L-R. Varying the amplitude of L-R before re-matrixing back to L and R will accentuate or minimize the channel differences - expanding or contracting the sound field. It's just a few opamps and resistors and a pot for the L-R. What Abraxalito said.

I don't know specifically about the Aiwa but often times the stereo 'wide' only inverts the phase of one channel. Pretty hokey.

G

Last edited by stratus46; 24th August 2012 at 08:26 AM.
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Old 24th August 2012, 08:40 PM   #10
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In post #3 of this link is a circuit: http://www.pinkfishmedia.net/forum/s...d.php?t=108344
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